JPH05274794A - Disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To always and properly record and reproduce even a signal whose specified frequency component is regarded as important. CONSTITUTION:An audio signal from an input terminal 1 is supplied to an A/D converter circuit 2 and digital data is formed. The data from the A/D converter circuit 2 is supplied to a first and a second sound compressing ATRAC encoder/decoder circuits 3, 23 designed so that respective frequency components regarded as important are different. The encoded data from the circuits 3, 23 are picked up alternately at every prescribed block by a switch 24 and written in a DRAM 5 through a shockproof memory controller 4. Further, communication is performed between the CPU 6 and the controller 4, when the data of a prescribed amt. is stored in the DRAM 5, the data is read and recorded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording / reproducing apparatus for recording / reproducing music or the like using a small magneto-optical disk.

[0002]

2. Description of the Related Art For example, a so-called mini disc (M
A disk system called D) has been proposed (see Japanese Patent Application No. 3-275067).

By the way, such a mini disc (M
In the recording / reproducing apparatus of D), a large amount of data compression is performed at the time of recording / reproducing. This compression is performed by deleting unnecessary data in accordance with the human auditory sense characteristics, and there is no problem with normal signals. However, such compression is not optimal for all signals, and details may be lost particularly in a signal that emphasizes specific frequency components such as low-frequency components and high-frequency components.

By the way, the mini disc (M
In the recording / reproducing apparatus D), the input signal is once written in the memory, then time-axis compressed and intermittently recorded on the disk. The present invention has been made in view of these points.

[0005]

The problem to be solved by the conventional device is that, in the conventional device, the detail may be lost in a signal that emphasizes a specific frequency component such as a low frequency component or a high frequency component. That is.

[0006]

SUMMARY OF THE INVENTION The present invention is a disk recording / reproducing apparatus in which a signal is data-compressed and intermittently recorded / reproduced on / from a disk 12, and a circuit for performing the data compression has a plurality of systems each having a different system. (Circuit 3, 2
3) A disc recording / reproducing apparatus which is provided and processes the signals by the circuits of the plurality of systems and records / reproduces the processed data (DRAM 5) in parallel on the disc.

[0007]

According to this, signals are processed by a plurality of circuits of different systems, and these processed data are recorded / reproduced in parallel on the disk, so that a particular frequency component is emphasized. Appropriate recording and reproduction can be always performed on signals.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 is an audio signal input terminal, for example. The audio signal from the input terminal 1 is supplied to the A / D converter circuit 2 to form digital data. The data from the A / D converter circuit 2 is supplied to the first and second audio compression ATRAC encoder / decoder circuits 3 and 23 designed so that the frequency components to be emphasized are different from each other. The encoded data from the circuits 3 and 23 is the switch 24.
, And the shocks are taken out alternately for every predetermined block.
DRAM 5 through proof memory controller 4
Written in.

Further, 6 is a CP for system control.
U, the control of the entire apparatus is performed in response to a signal from the operation unit 7, and the control state and the like are displayed on the display unit 8. When communication is performed between the CPU 6 and the controller 4 and a predetermined amount of data is accumulated in the DRAM 5, this data is read and recording is performed.

That is, the data read from the DRAM 5 through the controller 4 is converted into 8-14 data for recording (E).
FM) and error correction coding (CIRC) encoder / decoder circuit 9, and the encoded data from this circuit 9 is supplied to head drive circuit 10. As a result, the magnetic field of the recording head 11 is changed, and this change in magnetic field is supplied from the upper surface side of the mini disk (MD) 12.

Further, the signal from the CPU 6 is the servo circuit 1
It is supplied to the optical pickup 14 through the laser beam 3 and the laser is emitted from the lower surface side of the mini disc (MD) 12 at a predetermined timing. At this time, the optical pickup 1
The feed motor 15 of No. 4 and the spindle motor 15 of the mini disk (MD) 12 are controlled and driven by a signal from the servo circuit 13. In this way, the audio signal supplied to the input terminal 1 is recorded on the mini disc (MD) 12.

On the other hand, during reproduction, the signal from the optical pickup 14 is supplied to the encoder / decoder circuit 9 through the RF amplifier 17. Further, the signal from the RF amplifier 17 is supplied to the address decoder 18, and the cluster number corresponding to the absolute address on the mini disk (MD) 12 is determined. The cluster number from the address decoder 18 is sent to the CPU through the encoder / decoder circuit 9.
6 is supplied. As a result, the optical pickup 14 is moved to the recording area where desired data is recorded.

Further, the data decoded by the encoder / decoder circuit 9 is transferred to the DRAM through the controller 4.
Written to 5. Then, when a predetermined amount of data is accumulated in the DRAM 5, the data is read by a signal from the CPU 6, and the data is alternately distributed into predetermined blocks by the switch 24 and supplied to the encoder / decoder circuits 3 and 23. .. The data decoded by the circuits 3 and 23 is selected by the switch 25.

The data selected by the switch 25 is D
It is supplied to the / A converter circuit 19. And this D /
The signal converted into analog by the A converter circuit 19 is taken out to the output terminal 20 of the audio signal, for example. In this way, the data recorded on the mini disc (MD) 12 is reproduced and taken out to the output terminal 20.

Therefore, in this apparatus, on the mini disk (MD) 12, for example, the data from the encoder / decoder circuit 3 processed from the original signal as shown in FIG. Decoder circuit 23
, Data from, are recorded alternately in parallel. The ID is an index area for each data.

At the time of reproduction, for example, by switching the switch 25 with a signal from the operation unit 7 and selecting the data decoded by the encoder / decoder circuits 3 and 23, the data of the signal emphasizing the desired frequency component is selected. Output terminal 2 after being analogized by the D / A converter circuit 19
Can be taken out to 0.

Thus, according to the above-mentioned device, the signals are processed by the circuits (3, 23) of a plurality of systems having different systems, and these processed data are recorded / reproduced in parallel on the disk 12, for example, It is possible to always perform appropriate recording / reproduction even for a signal that emphasizes a specific frequency component.

In the above-mentioned apparatus, the encoder / decoder circuits 3 and 23 may be provided with three or more systems so that different systems can perform the processes and record and reproduce in parallel.

Further, in the above-mentioned device, the user can arbitrarily select the encoder / decoder circuits 3 and 23 by the sense of hearing. Alternatively, in accordance with the signal to be recorded / reproduced, the information is inserted into, for example, the index area (ID) of each data shown in FIG.
It may be recorded above and automatically selected during reproduction.

[0020]

According to the present invention, signals are processed by a plurality of circuits of different systems, and these processed data are recorded / reproduced in parallel on a disc.
For example, it has become possible to always perform appropriate recording / reproducing even for a signal that emphasizes a specific frequency component.

[Brief description of drawings]

FIG. 1 is a block diagram of an example of a disc recording / reproducing apparatus according to the present invention.

FIG. 2 is a diagram for explaining that.

[Explanation of symbols]

1 For example, an audio signal input terminal 2 A / D converter circuit 3 First audio compression ATRAC encoder / decoder circuit 4 Shock proof memory controller 5 DRAM 6 System control CPU 7 Operation unit 8 Display unit 9 8 -14 conversion (EFM) and error correction coding (CIR)
C) encoder / decoder circuit 10 head drive circuit 11 recording head 12 mini disk (MD) 13 servo circuit 14 optical pickup 15 feed motor 16 spindle motor 17 RF amplifier 18 address decoder 19 D / A converter circuit 20 For example of audio signal Output terminal 23 Second audio compression ATRAC encoder / decoder circuit 24, 25 switch

Claims (2)

[Claims] 1. A disk recording / reproducing apparatus which compresses data of a signal and intermittently records / reproduces the signal on / from a disk, wherein a circuit for performing the data compression is provided in a plurality of systems each having a different system, and the signal is provided in the plurality of systems. A disc recording / reproducing apparatus which processes the data in a circuit and records / reproduces the processed data in parallel on the disc. 2. A circuit for processing the data recorded / reproduced in parallel on the disk by the circuits of the plurality of systems, selecting the signal in the circuits of the plurality of systems, and performing the data compression by the selection. 2. The disc recording / reproducing apparatus according to claim 1, wherein is selected.